Sketch of the setup of the ALMA correlator during the spectral scan observations in the ALMA band 6. The observations are divided into two frequency ranges: low frequencies from 211 to 246 GHz and high frequencies from 240 to 275 GHz. Each frequency tuning is depicted with a different color, while the different boxes refer to the four spectral windows per tuning. The number of the spectral windows, as given in the ALMA observations, are given on top of each box. The gray line shows the transmission of the atmosphere at the ALMA site with a precipitable water vapor of 0.7 mm.
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